Jeff, you do have some specific suggestions? For both two and four port devices.
I completely agree with you on good quality instruments. I have a Fluke digital voltmeter (DVM) with over 20 years of age and I would never give it up. Expensive (at first), but a rugged workhorse that lasts.
Thanks!
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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